Pump piston and rod



p 1958 T. E. COOPER, JR 2,853,347

7 PUMP PISTON AND ROD Filed March 16, 1956 7770mm" Coo oer,

United Spares Patent PUMP PISTON AND ROD Thomas E. Cooper, Jr., Houston,Tex.

Application March 16, 1956, Serial No. 572,089

2 Claims. (Cl. 309-17) This invention relates to new and usefulimprovements in a pump piston and rod.

It is an object of this invention to provide novel means for mounting apiston on a piston rod so that the piston may be quickly and easilydetached from the rod and removed.

It is another object of the invention to provide a piston and piston rodconstruction, and a piston moving means, that will permit ready and easyconnection or disconnection of the piston from the rod and removal ofthe piston from the pump cylinder or mounting the same on the rod in apump cylinder.

It is still a further object of the invention to provide means forremoving pistons that may be easily and cheaply manufactured and thatwill provide means simple in operation for accomplishing the work.

With the above and other objects in view, the invention has relation tocertain novel features of construction, operation and arrangement ofparts more particularly defined in the following specifications andillustrated in the accompanying drawings, wherein:

Figure 1 is a side elevational view, in cross section, illustrating thepiston puller in piston pulling position preparatory to disconnectingthe piston from the piston rod.

Figure 2 is a side elevational view, in cross section, illustrating thepiston puller in pulling position, after the piston has beendisconnected from the piston rod and is being removed from the liner,and

Figure 3 is a perspective view of the puller shaft and bar.

Referring now more particularly to the drawings, the numeral 1designates a housing, such as the housing of a mud pump, having a liner2 and studs 3, 3. The piston rod 5 is provided with an internallythreaded socket 6 at the terminus thereof, which said socket is axiallycentered and provided with an annular shoulder 7. The piston is formedof a piston head 8, which has the reduced and tapered externallythreaded terminus 9, having an annular shoulder 10, the threaded portion9 meshing with the threads of the socket 6 and the shoulders 7, 9abutting, when the parts are screwed tightly together, making a flushjoint.

Grooves, as 11, 11, may be provided in the piston head 8 to receive snaprings which abut against the usual retainer plates as 24, 24, and lockthe rubber piston body members 12, 12 in place on the head 8. The centerplate 13 is integral with the head 8, and the outer end of the head 8 isreduced as at 14 and shaped to Hce receive a socket wrench, as 15, andis preferably provided with an orifice 16, and the wrench 15 may also beprovided with orifices, as 17, 17, through which a pin 18 may beinserted to aid in the withdrawal of the piston. Any suitable handle maybe provided on the extended end of the wrench 15, such as the detachablymounted cross bar 20.

A supporting bar as 21 may be provided having suitable stud receivingorifices 22, 22 and a center orifice 23 through which the wrench 15projects to maintain the wrench in alignment with the piston rod when inuse.

When it is desired to remove the piston, the pump head cover (not shown)is removed from the studs 3, 3 and the wrench 15, with its shaftextended through the orifice 23 of the bar 21, is applied to the pistonby mounting the orifices 22, 22 of the bar 21 on to two diametricallyopposed studs 3, 3 on the well head, and applying the socket of thewrench to the end 14 of the piston head 8 and turning the wrench bymeans of the handle 20, backing the piston terminus 9 out of the socket6 in the piston rod, and the piston then withdrawn from the liner. Whenthe head 8 and rod 5 are disconnected, the piston will usually readilyslip out of the liner, and may be thus withdrawn by the hand of theuser, but if, for any reason, the piston does not readily slip out ofthe liner, the pin, 18, which may be a common nail of the desired size,may be inserted through the orifice 17 in the wrench and the orifice 16in the piston head, and pressure applied in any suitable manner to thehandle 20, to remove the piston While the foregoing is considered apreferred form of the invention, it is by way of illustration only,while the broad principle of the invention is defined by the appendedclaims.

What I claim is:

1. In a pump piston and rod, a piston head, one end thereof having anexternally threaded outwardly tapered projection, a piston rod having anaxial internally threaded and inwardly tapered socket formed in theextended end thereof, a wrench receiving means on the other end of saidhead for the rotation of said head to engage and disengage saidprojection with said piston rod, detachably mounted means for guiding awrench during engagement and disengagement of the piston with the pistonrod.

2. In a pump piston and rod for use on mud pumps and the like, a pistonrod having an internally threaded socket in the piston receiving endthereof and an an nular shoulder adjacent said socket, a piston headhaving one end reduced in diameter forming an annular shoulder adaptedto abut against said annular shoulder on said piston rod and having saidreduced portion externally threaded and formed to be received by saidsocket in said piston rod, the opposite end of said head having areduced portion formed to receive a socket wrench, means for maintaininga socket wrench in alignment with said head and detachably secured tosaid head.

References Cited in the file of this patent UNITED STATES PATENTS1,618,600 Matthews Feb. 22, 1927 2,519,144 MacClatchie AugQlS, 19502,758,897 Naab Aug. 14, 1956

